KR101235889B1 - Method for Water Treatment - Google Patents

Method for Water Treatment Download PDF

Info

Publication number
KR101235889B1
KR101235889B1 KR1020110017432A KR20110017432A KR101235889B1 KR 101235889 B1 KR101235889 B1 KR 101235889B1 KR 1020110017432 A KR1020110017432 A KR 1020110017432A KR 20110017432 A KR20110017432 A KR 20110017432A KR 101235889 B1 KR101235889 B1 KR 101235889B1
Authority
KR
South Korea
Prior art keywords
converter sludge
converter
sludge
water treatment
influent
Prior art date
Application number
KR1020110017432A
Other languages
Korean (ko)
Other versions
KR20120097895A (en
Inventor
권혁기
이윤모
박동철
Original Assignee
현대제철 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대제철 주식회사 filed Critical 현대제철 주식회사
Priority to KR1020110017432A priority Critical patent/KR101235889B1/en
Publication of KR20120097895A publication Critical patent/KR20120097895A/en
Application granted granted Critical
Publication of KR101235889B1 publication Critical patent/KR101235889B1/en

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]

Abstract

수처리 방법이 개시된다. 본 발명의 일측면에 따른 수처리 방법은, 전로공정에서 회수된 전로슬러지를 파쇄하는 단계, 유입수에 전로슬러지 및 과산화수소를 투입하여, 유입수를 펜톤산화 처리하는 단계, 전로슬러지를 침전시켜 회수하는 단계를 포함한다.A water treatment method is disclosed. The water treatment method according to an aspect of the present invention, the step of crushing the converter sludge recovered in the converter process, by adding the converter sludge and hydrogen peroxide to the influent, the step of fenton oxidation treatment of the influent, the step of recovering by precipitating the converter sludge Include.

Description

수처리 방법{Method for Water Treatment}Method for Water Treatment

본 발명은 수처리 방법에 관한 것으로, 보다 상세히 전로슬러지를 이용한 수처리 방법에 관한 것이다.
The present invention relates to a water treatment method, and more particularly to a water treatment method using converter sludge.

철강산업에서는 유가자원인 철을 포함하는 다양한 부산물이 생성된다. 특히, 전로공정에서는 철광석, 소결광석, 더스트 단광 등의 투입으로 철을 함유한 더스트와 슬러지가 대량으로 발생되고 있다. In the steel industry, various by-products are produced, including iron, a valuable resource. In particular, in the converter process, a large amount of dust and sludge containing iron is generated by input of iron ore, sintered ore, dust briquettes, and the like.

이러한 전로공정의 부산물들은 초창기에는 그대로 폐기처리 되었으나, 점결제(Bonding Material)를 이용하여 일정형태로 고형화 한 후 전로에 냉각재로 재활용하는 기술이 개발되어 재활용되고 있다. 그러나, 유가자원으로서 전로슬러지를 사용하는 방법은 크게 개발되지 않은 실정이다.
By-products of this converter process were initially disposed of as it was, but the technology of solidifying to a certain form by using a binder material (Bonding Material) and recycling it as a coolant in the converter has been developed and recycled. However, a method of using converter sludge as a valuable resource has not been largely developed.

본 발명의 실시예는 전로공정에서 부산물로 생성된 전로슬러지의 자원활용도를 높일 수 있는 수처리 방법을 제공하는 것이다.
An embodiment of the present invention is to provide a water treatment method that can increase the resource utilization of the converter sludge produced as a by-product in the converter process.

본 발명의 일측면에 따른 수처리 방법은, 전로공정에서 회수된 전로슬러지를 파쇄하는 단계, 유입수에 상기 전로슬러지 및 과산화수소를 투입하여, 상기 유입수를 펜톤산화 처리하는 단계, 상기 전로슬러지를 침전시켜 회수하는 단계를 포함한다.In the water treatment method according to an aspect of the present invention, the step of crushing the converter sludge recovered in the converter process, by introducing the converter sludge and hydrogen peroxide to the influent, the step of fenton oxidation treatment of the influent, precipitation of the converter sludge recovered It includes a step.

수처리 방법은, 상기 펜톤산화 처리단계 이전에, 상기 유입수에 산을 투입하여 pH농도를 조절하는 단계를 더 포함할 수 있다.The water treatment method may further include adjusting the pH concentration by adding an acid to the influent before the fenton oxidation treatment step.

상기 전로슬러지 파쇄단계는, 상기 전로슬러지를 건조하는 단계, 상기 건조된 전로슬러지를 1 내지 5mm로 파쇄하는 단계를 포함할 수 있다.The converter sludge crushing step may include the step of drying the converter sludge, crushing the dried converter sludge to 1 to 5mm.

상기 펜톤산화 처리단계는, 화학적산소요구량(COD)을 기준으로 측정되는 산소량 요구량 1g당, 전로슬러지 0.5g 내지 1.0g 및 과산화수소 0.01ml 내지 0.05ml를 투입하는 단계를 포함할 수 있다.The fenton oxidation treatment step may include adding 0.5 g to 1.0 g of converter sludge and 0.01 ml to 0.05 ml of hydrogen peroxide, per 1 g of oxygen content required based on chemical oxygen demand (COD).

상기 전로슬러지 회수단계는, 침전조에서 상기 전로슬러지를 침전시키는 단계, 상기 침전된 전로슬러지를 탈수 및 건조시키는 단계, 상기 건조된 전로슬러지를 파쇄하는 단계를 더 포함할 수 있다.
The converter sludge recovery step may further include the step of precipitating the converter sludge in a settling tank, dehydrating and drying the precipitated converter sludge, and crushing the dried converter sludge.

본 발명의 실시예에 따르면, 전로슬러지에서 특징적으로 높은 함량을 가지는 금속상태의 철을 수처리를 위한 펜톤산화법에 이용함으로써, 유가자원으로서 전로슬러지의 활용도를 높일 수 있다.
According to the embodiment of the present invention, by using the iron in the metal state having a characteristically high content in the converter sludge for the Fenton oxidation method for water treatment, it is possible to increase the utilization of the converter sludge as valuable resources.

도 1은 본 발명의 일 실시예에 따른 수처리 방법을 설명하는 순서도.
도 2는 전로슬러지의 성분 구성을 나타낸 도면.1 is a flow chart illustrating a water treatment method according to an embodiment of the present invention.
2 is a view showing a component configuration of converter sludge.

이하에서 본 발명의 실시예를 첨부도면을 참조하여 상세하게 설명한다. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 일 실시예에 따른 수처리 방법을 설명하는 순서도이다.1 is a flow chart illustrating a water treatment method according to an embodiment of the present invention.

본 발명의 일 실시예에 따른 수처리 방법은 전로슬러지 파쇄단계, 펜톤산화 처리단계 및 전로슬러지 회수단계를 포함하여, 난분해성물질을 제거하는 펜톤산화 처리에 필요한 2가철(

Figure 112011014083664-pat00001
)을 전로슬러지를 통하여 공급할 수 있다.
The water treatment method according to an embodiment of the present invention includes a ferric iron required for fenton oxidation treatment to remove hardly decomposable substances, including a converter sludge crushing step, a fenton oxidation treatment step, and a converter sludge recovery step.
Figure 112011014083664-pat00001
) Can be supplied through converter sludge.

전로슬러지 파쇄단계에서는, 후술할 펜톤산화 처리단계에서 금속상태의 철에 대한 화학반응이 잘 이루어지도록 전로슬러지를 파쇄한다.In the converter sludge crushing step, the converter sludge is crushed so that the chemical reaction with iron in the metal state is performed well in the fenton oxidation treatment step described later.

전로공정에서 발생하는 부산물인 전로슬러지는 폐수에 혼입된 형태로 배출되므로, 본 실시예에서는 필터프레스 등의 여과장치를 이용하여 전로슬러지를 걸러내고, 탈수한 후 건조하여 케이크 상태의 전로슬러지를 얻는다.Since the converter sludge, which is a by-product generated in the converter process, is discharged in the form of mixed in the waste water, in this embodiment, the converter sludge is filtered using a filtration device such as a filter press, dehydrated, and dried to obtain cake sludge. .

그리고, 전로슬러지에 포함된 금속상태의 철이 펜톤산화 처리 시에 노출되도록 건조된 케이크 상태의 전로슬러지를 파쇄한다.Then, the cake-type converter sludge dried so as to be exposed during the Fenton oxidation treatment of the metal state contained in the converter sludge is crushed.

구체적으로, 본 실시예에서는 건조된 전로슬러지를 1mm 내지 5mm로 파쇄하여, 펜톤산화 처리에서 철에 대한 반응을 용이하게 할 수 있다. 또한, 1mm 내지 5mm 크기의 전로슬러지는 침전성도 확보되어서 후술할 전로슬러지 회수단계에서 전로슬러지의 회수를 용이하게 할 수 있다.
Specifically, in the present embodiment, the dried converter sludge may be crushed to 1 mm to 5 mm, thereby facilitating a reaction with iron in the fenton oxidation treatment. In addition, the 1mm to 5mm size of the converter sludge is also secured sedimentation can be facilitated recovery of the converter sludge in the converter sludge recovery step to be described later.

펜톤산화 처리단계에서는, 수처리할 유입수에 전로슬러지 및 과산화수소를 투입하여 유입수를 펜톤산화 처리한다.In the fenton oxidation step, converter sludge and hydrogen peroxide are added to the influent to be treated, and the influent is fentonized.

펜톤산화를 이용한 수처리는 과산화수소(

Figure 112011014083664-pat00002
)와 철염을 이용하여 수산화라디칼(OH: hydroxyl Radical)을 발생시켜 유기화합물을 분해하는 것으로서, 2가철(
Figure 112011014083664-pat00003
)과 수산화라디칼에 의한 산화공정, 처리수 중화공정 및 철염을 제거하기 위한 응집공정의 3단계를 거치게 된다.Water treatment using Fenton's oxidation was performed with hydrogen peroxide (
Figure 112011014083664-pat00002
) And iron salt to generate hydroxyl radical (OH) to decompose organic compounds.
Figure 112011014083664-pat00003
) And three steps of oxidation process by radicals of hydroxyl radical, neutralization of treated water and flocculation process to remove iron salt.

즉, 처리대상 유입수에 과산화수소(

Figure 112011014083664-pat00004
)와 철염을 주입하게 되면, 2가철(
Figure 112011014083664-pat00005
)이 과산화수소로부터 수산화라디칼을 발생시키면서 자신은 3가철(
Figure 112011014083664-pat00006
)로 산화되며, 이때 발생된 수산화라디칼이 유기물을 분해하게 된다.
In other words, hydrogen peroxide (
Figure 112011014083664-pat00004
) And iron salt, bivalent iron (
Figure 112011014083664-pat00005
While generating radical hydroxide from hydrogen peroxide,
Figure 112011014083664-pat00006
Is oxidized to), and the generated radical radicals decompose organic matter.

주요한 반응식은 다음과 같다.The main scheme is as follows.

Figure 112011014083664-pat00007

Figure 112011014083664-pat00007

본 실시예에서는 펜톤산화 처리에 필요한 2가철을 전로슬러지에 포함된 금속상태의 철부터 얻음으로써, 부산물인 전로슬러지를 유가자원으로 이용할 수 있게 한다.In this embodiment, by obtaining the ferrous iron required for the fenton oxidation treatment from iron in the metal state contained in the converter sludge, it is possible to use the by-product converter sludge as a valuable resource.

도 2는 전로슬러지의 성분 구성을 나타낸 도면이다.2 is a diagram showing the composition of the converter sludge.

도 2에 나타난 바와 같이, 전로슬러지는 제철공정의 다른 부산물에 비하여 월등히 많은 금속상태의 철을 함유하고 있다(대략, 20%이상). 금속상태의 철은 용해되면 주로 2가철 상태로 존재하게 되므로, 본 실시예에서는 펜톤산화 처리에 필요한 2가철을 전로슬러지에 다량 포함된 금속상태의 철로부터 얻는다.As shown in Figure 2, the converter sludge contains significantly more iron in the metal state than other by-products of the steelmaking process (approximately 20% or more). Since the iron in the metal state is mainly in the ferric state, it is obtained in the present embodiment from the iron in the metal state contained in the converter sludge in large amount.

구체적으로, 본 실시예에서는 화학적산소요구량(COD) 기준으로 측정되는 산소량 요구량 1g에 대하여, 전로슬러지 0.5g 내지 1.0g 및 과산화수소 0.01ml 내지 0.05ml를 투입한다. 즉, 유입수의 수량(ℓ)에 화학적산소요구량 수치(ppm, mg/ℓ)를 곱하여 수처리에 필요한 산소량을 질량으로 산출한 후에, 질량(1g) 대비 상기 값 범위의 전로슬러지 및 과산화수소를 투입한다.Specifically, in the present embodiment, 0.5 g to 1.0 g of converter sludge and 0.01 ml to 0.05 ml of hydrogen peroxide are added to 1 g of the oxygen demand required based on the chemical oxygen demand (COD). That is, multiplying the amount of water intake (l) by the chemical oxygen demand value (ppm, mg / l) to calculate the amount of oxygen required for the water treatment as a mass, and then input the converter sludge and hydrogen peroxide in the above-described range to the mass (1 g).

이 때, 펜톤산화를 촉진하기 위하여, 펜톤산화 처리 이전에 수처리할 유입수에 산을 투입하여 pH를 조절할 수 있다.At this time, in order to promote fenton oxidation, the pH may be adjusted by adding acid to the influent to be treated before the fenton oxidation treatment.

본 실시예에서는 유입수가 저장된 수조에 황산을 투입하여 유입수의 pH농도를 펜톤산화가 잘 이루어지는 pH3 내지 pH4로 조절한다.
In this embodiment, sulfuric acid is added to the tank where the influent is stored to adjust the pH of the influent to pH 3 to pH 4 where fenton oxidation is well performed.

전로슬러지 회수단계에서는, 유가자원인 철을 재활용하기 위하여 펜톤산화 처리 후에 처리수에서 전로슬러지를 침전시켜 회수한다.In the converter sludge recovery step, the converter sludge is precipitated and recovered from the treated water after the fenton oxidation treatment in order to recycle the valuable resources iron.

본 실시예에서는 처리수를 침전조에 유입 시킨 후에, 전로슬러지를 침전시켜 분리한다. 이 때, 전로슬러지는 상술한 바와 같이 1mm 내지 5mm로 파쇄되어 있어서 침전성이 확보된다. In this embodiment, after the treated water is introduced into the settling tank, the converter sludge is precipitated and separated. At this time, the converter sludge is crushed to 1 mm to 5 mm as described above to secure the sedimentation property.

다음으로, 침전된 전로슬러지를 탈수기 등으로 탈수한 후에 건조하여 처리수에서 철을 함유한 전로슬러지를 분리한다. 분리된 전로슬러지는 다시 파쇄되어 펜톤산화 처리에 이용됨으로써 재활용될 수 있다.
Next, the precipitated converter sludge is dehydrated with a dehydrator and then dried to separate the iron-containing converter sludge from the treated water. The separated converter sludge can be crushed again and used for fenton oxidation to be recycled.

상술한 바와 같이, 본 실시예에 따른 수처리 방법은 전로슬러지에서 특징적으로 높은 함량을 가지는 금속상태의 철을 펜톤산화법에 이용함으로써, 유가자원으로서 전로슬러지의 활용도를 높일 수 있다.
As described above, the water treatment method according to the present embodiment can increase the utilization of the converter sludge as a valuable resource by using the metal state iron having a characteristically high content in the converter sludge in the fenton oxidation method.

상기에서는 본 발명의 실시예를 참조하여 설명하였지만, 해당 기술 분야에서 통상의 지식을 가진 자라면 하기의 특허 청구의 범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다.Although the above has been described with reference to embodiments of the present invention, those skilled in the art may variously modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. And can be changed.

전술한 실시예 외의 많은 실시예들이 본 발명의 특허청구범위 내에 존재한다.Many embodiments other than the above-described embodiments are within the scope of the claims of the present invention.

Claims (5)

전로공정에서 회수된 전로슬러지를 파쇄하는 단계;
유입수에 상기 전로슬러지 및 과산화수소를 투입하여, 상기 유입수를 펜톤산화 처리하는 단계; 및
상기 전로슬러지를 침전시켜 회수하는 단계를 포함하고,
상기 전로슬러지 회수단계는,
침전조에서 상기 전로슬러지를 침전시키는 단계;
상기 침전된 전로슬러지를 탈수 및 건조시키는 단계; 및
상기 건조된 전로슬러지를 파쇄하는 단계를 더 포함하는 수처리 방법.
Crushing the converter sludge recovered in the converter process;
Injecting the converter sludge and hydrogen peroxide into the influent to fenton the influent; And
Collecting and recovering the converter sludge,
The converter sludge recovery step,
Precipitating the converter sludge in a settling tank;
Dehydrating and drying the precipitated converter sludge; And
Water treatment method further comprising the step of crushing the dried converter sludge.
제1항에 있어서,
상기 펜톤산화 처리단계 이전에,
상기 유입수에 산을 투입하여 pH농도를 조절하는 단계를 더 포함하는 수처리 방법.
The method of claim 1,
Before the fenton oxidation treatment step,
Injecting an acid into the influent water further comprising the step of adjusting the pH concentration.
제1항에 있어서,
상기 전로슬러지 파쇄단계는,
상기 전로슬러지를 건조하는 단계; 및
상기 건조된 전로슬러지를 1mm 내지 5mm로 파쇄하는 단계를 포함하는 것을 특징으로 하는 수처리 방법.
The method of claim 1,
The converter sludge crushing step,
Drying the converter sludge; And
Water treatment method comprising the step of crushing the dried converter sludge to 1mm to 5mm.
제1항에 있어서,
상기 펜톤산화 처리단계는,
화학적산소요구량(COD)을 기준으로 측정되는 산소량 요구량 1g당, 전로슬러지 0.5g 내지 1.0g 및 과산화수소 0.01ml 내지 0.05ml를 투입하는 단계를 포함하는 것을 특징으로 하는 수처리 방법.
The method of claim 1,
The fenton oxidation treatment step,
A water treatment method comprising the step of adding 0.5 g to 1.0 g of converter sludge and 0.01 ml to 0.05 ml of hydrogen peroxide, per 1 g of the oxygen content required based on the chemical oxygen demand (COD).
삭제delete
KR1020110017432A 2011-02-25 2011-02-25 Method for Water Treatment KR101235889B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110017432A KR101235889B1 (en) 2011-02-25 2011-02-25 Method for Water Treatment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110017432A KR101235889B1 (en) 2011-02-25 2011-02-25 Method for Water Treatment

Publications (2)

Publication Number Publication Date
KR20120097895A KR20120097895A (en) 2012-09-05
KR101235889B1 true KR101235889B1 (en) 2013-02-21

Family

ID=47109035

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110017432A KR101235889B1 (en) 2011-02-25 2011-02-25 Method for Water Treatment

Country Status (1)

Country Link
KR (1) KR101235889B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107162382A (en) * 2016-03-07 2017-09-15 深圳市慧源环境技术有限公司 A kind of mud dewatering method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000053679A (en) * 1999-07-21 2000-09-05 김재규 Wastewater treatment method using hydrogen peroxide and pressured air and apparatus thereof
KR20010107341A (en) * 2000-05-26 2001-12-07 장윤석 Method of Treating Highly Concentrated Organic Waste Water using Recycled Steeler's Dust as Catalysts
JP2006281129A (en) 2005-04-01 2006-10-19 Hitachi Ltd Water treatment method and apparatus
KR20100046990A (en) * 2008-10-28 2010-05-07 현대제철 주식회사 Reaction catalyst using steel slag for treating wastewater, and method for treating wastewater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000053679A (en) * 1999-07-21 2000-09-05 김재규 Wastewater treatment method using hydrogen peroxide and pressured air and apparatus thereof
KR20010107341A (en) * 2000-05-26 2001-12-07 장윤석 Method of Treating Highly Concentrated Organic Waste Water using Recycled Steeler's Dust as Catalysts
JP2006281129A (en) 2005-04-01 2006-10-19 Hitachi Ltd Water treatment method and apparatus
KR20100046990A (en) * 2008-10-28 2010-05-07 현대제철 주식회사 Reaction catalyst using steel slag for treating wastewater, and method for treating wastewater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107162382A (en) * 2016-03-07 2017-09-15 深圳市慧源环境技术有限公司 A kind of mud dewatering method

Also Published As

Publication number Publication date
KR20120097895A (en) 2012-09-05

Similar Documents

Publication Publication Date Title
CN101219844B (en) Technique for biological treatment of mine acidic wastewater
US20110127220A1 (en) Method for Treating Water by Advanced Oxidation and Ballasted Flocculation, and Corresponding Treatment Plant
WO2014131142A1 (en) Harmless comprehensive treatment method for cyanide tailing pulp
CN101716487A (en) Steel slag composite adsorbing agent and method for processing printing and dyeing wastewater
CN110240122B (en) Method for one-step detoxification and sulfur recovery of arsenic sulfide slag
CN105439209B (en) Method for preparing ozone oxidation catalyst gamma-FeOOH after neutralization of waste acid by using nickel laterite ores
CN103435195A (en) Method for treating acid and salty organic wastewater
CZ300446B6 (en) Method of treatment of iron-containing waterworks sludge and a mixture prepared by this method
CN109111013B (en) Method for treating wastewater containing water-soluble silicone oil by using organic silicon
JP5223338B2 (en) Wastewater treatment method
CN104496139A (en) Pretreatment method of heavy metal sludge
CN104178630A (en) Treatment method of cupriferous sludge
JP5118572B2 (en) Sewage treatment method
CN110182995A (en) Advanced treatment method for carbonization wastewater
JPH1147764A (en) Treatment of arsenic-containing waste water
KR101235889B1 (en) Method for Water Treatment
CN104402062A (en) Method for preparing ferric chloride from pyrite cinder
CN104787933A (en) Treatment method for gold-smelting cyanide-containing wastewater
CN110075697B (en) Flue gas desulfurization and resource utilization method based on electrolytic manganese tailing slag
CN103787535A (en) Treatment method of sludge water of underground water plant
CN101704593A (en) Method for separating and recycling zinc, iron, manganese in acidic mine waste water
KR102068411B1 (en) Circulatory Method of Recovery and Recycle of Iron in Fenton Inorganic Sludge
JP2017159222A (en) Method for removing arsenic
CN105330064A (en) Zinc-containing cyanide barren solution treatment method
CN105692954A (en) Method of reducing residue yield during acidic wastewater treatment

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee